A hero of ancient Greece vows to save a princess from being sacrificed to a ferocious sea monster. However, to defeat the creature he must first embark on a journey into the underworld and seize the head of the monstrous Medusa, whose gaze turns men to stone. Mythical adventure, starring Harry Hamlin, Laurence Olivier, Maggie Smith and Judi Bowker, with special effects by Ray Harryhausen